Loom for weaving wire fabric



W. KELLER pail- 25, 1927. 1,647,113

1100M FOR WEAVING WIRE FABRIC Filed June 7. 1926 2 511951193130 1 a, a K

. Ke//er mremor Oct; 25, 1927.

w. KELLER LOOM FOR WEAVING WIRE FABRIC Filed June '7. 1926 .1 2 Shaw-Sheet 2 Patented Oct. 25, 1927.

UNITED STATES 1,647,113 PATENT OFFICE.

WILI-IELM KELLER, OF RON SDORF, GER-MANY.

LOOM FOR WEAVING WIRE FABRIC.

Application filed'June 7, 1926, Serial No. 114,310, and in Germany March 3, 1925.

In machine sieves used, in the manufacture of paper the type of weave employed in the sieves isv such that the paper rests only on the separate warp threads. Conse-,

quently they are soon worn down, while the weft thread which is entirely surrounded by the warp threads is not subjected-to any wear whatever.

According to the present invention the fabric of the sieve is woven in such a man-v only 'on' the separate raised parts of the war Machine sieves of this kind are made with an arrangement of a specialkind, which forms the subject of the present invention, the arrangement consisting in providing guiding blades which beat-up bars loosely guided between them. These beat-up bars are engaged by a slide at each end of the bar in the direction of width of the fabric and are beaten up against the fabric. In order'that these bars shall beat up successively, the'slide'is provided with an upwardly inclined groove. This groove commences at the surface where the bars rest and terminates at the same surface, but is provided with a. sharp edge at each end, to ensure the bars being picked up. Simultaneously with each part of the weft thread being beaten up the shed is formed in such a manner that, when the weft thread has been completely beaten up, the change of shed will already have taken lace. The arrangement for changing the shed must thus work independently of the beating up arrangement. For this purpose two superposed wedge-shaped members are connected to the slide at each side, the

wedges having their pointed ends facing each other and two of which always lie alternately in one plane. These two oppositely located wedge-shaped members actuate heddles, which guide the warp threads. Owing to the wedgeshape, the heddles are pushed laterally, so that the warp threads are stationary and.

held in them are forced to take part inthis lateral displacement, the heddles resting aga nst the wedge-shaped members in the upper plane being displaced in one direction;

ing a diagrammatic representation ofthe woven wire fabric as seen from the front,

Figure 2 a plan view of Figure 1, Figure 3,

a front viewof the arrangement for making the sieves according to Figures 1 and 2' with a picked weft and the slides in the position of rest, Figure 4 a front view of the ar-- rangement with the weft picked and partly beaten up, Figure 5 a sectionjon line 55 of Figure 4 and Figure 6 a section on line 66 of Figure 4. The separate warp threads a lying next to one another are connected together by the insertion of the. thread 6, forming a lower and an upper shed, the warp threads being bent by this means.

way by being beaten up by the reed, but by the sections of the weft thread'lying between the warp threads being pressed separately, against the fabric, a shed'being formed at the same time. 7 As will be seen from Figure I 2, in this'way of weaving in the portion of fabric cut oif by the section lines m y, twelve points of contact for the paper are established (1 to 12). The woven fabric according to the invention will thus only wear half as quickly as the fabric of the known kind. Furthermore the points of contact for the paper are closer together, so that in the case of thin paper the sieve markings are considerably reduced.

The arrangement for making the sieve is shown in Figures 3 to 6.

In a machine frame the two guiding reeds s and t are rigidly fixed in a vertical position. On either side of these reeds the two slides cl and e slide in guiding rails a, which slides may be driven mechanically in any desired manner in a horizontal plane.

The weft thread 6 is inserted between the warp threads in such a manner This may for instance be ill) These .two slides have at their upper edge guiding grooves f and g respectively which ascend and descend in the form of awedge. In these grooves slide the ends of the beat up bars h which are guided between the separate blades of the guiding reeds s and t. Each of the two slides also supports by means of the straps a two wedge-shaped pieces is, m, n and Z, which he one above the other with their wedge-shaped ends facing each other. Against these wedge-shaped pieces the heddles 0 and p alternately rest, supporting the warp threads These heddles are also guided between the reed blades of "the two reeds s and t. The arrangement operates in the following manner:

When the weft thread 7" has been inserted, the slides d and e are moved along the two reeds s and t. The two slides bymeans of their grooves and 9 pick up the beat-up bars 7i, whereby the latter are raised separately between the reeds s and t, owing to the inclination of the guiding grooves (Fig. .4). By this raising of the bars h the weft is beaten up successively from one side of the fabric to the other. During the forward movement of the slides (Z and e the wedge shaped members is, Z, m, n become operative, the wedge m pushing the heddles p to the right and the wedge Z the heddles 0 to the left and the shed being thus changed. On the slides moving in the other direction, the wedge-shaped members 7: and n become operative andiagain change the shed. Each change of the shed between the reed blades is completed, when the heddies 0 or 79 respectively have travelled along the inclined surface of the corresponding wedge-shaped members and have reached the flat portion of the wedge. At the same time at the same part of the fabric or between the same reed blades the weft thread will have been beaten up by the bars 7b which slide between the corresponding reed blades, having travelled along the upwardly inclined part of the guide groove f and reached the straight portion thereof. Figure 5 shows the various parts in position, in which the weft thread 7" has just been beaten up, the shed changed and a new shed has been opened for the next pick. It is of forcing the said beat-up bars against the fabric, as set forth.

2. An apparatus for weaving machine sieves for use in the manufacture of paper, comprising in combination fixed reed blades,

beat-up bars guided between the-said reed blades, two slides in engagement with the said beat-up bars, means for guiding the slides on either side of the woven fabric in the direction of its width, means for forcing the said'beat-up bars against the fabric, said means comprising an arched groove in each slide terminating in a sharp edge at either end at the surface on which the beat-up bars rest, as and f'or'the purpose set forth;

3. An apparatus for weaving machine sieves for use in the manufacture of paper, comprising in combination fixed reed blades,

beat-up bars guided between the said reed blades,'two slides in engagement withthe said beat-up bars, means for guiding the slides on either side of the woven fabric in the direction of its width, means for forcing the said beat-up bars against the fabric, a plurality of heddles for guiding the warp threads, and two superposed W'edgeshaped members connected to each slide, said members being adapted to en-.

gage said heddles to form a shed.

4. An apparatus for weaving sieves as claimed 1n claim 3, the faces of said wedge-- shaped members being-in fixed relation to the arch groove, so that a maximum size shed Wlll be formed adjacent the top of said arched groove.

In testimony whereof I affixed my signature.

WILHELM KELLER; 

